One of the bottles had been placed or thrown onto or near a porch of a Longmont residence on the 1600 block of Green Place, a neighborhood southeast of Sunset Golf Course, where it reportedly exploded about 10 p.m., according to police reports.

The other explosion, reported 20 to 30 minutes later, involved a bottle placed underneath a vehicle several miles away, on the 700 block of Elliot Street on the city's east side.

Longmont Police Cmdr. Jeff Satur said Sunday that "these are very dangerous to all, because they are extremely unpredictable. You can never predict when they will go off, often injuring the person experimenting with or using these types of devices."

If the same perpetrators were involved in both incidents, the bombs could have gone off in their vehicle as they were traveling from one location to the other, Satur said.

"It spooked us," said Melanie Cayce -- who was watching TV with her 10-year-old daughter, Ashley Cayce, and her fiance, Don Ackerman, along with the family's 3-month infant boy, Axel Ackerman -- when they heard "a big boom" at their Green Place home on Saturday night.

"It sounded like a gunshot," Cayce said on Sunday.

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The family was in a lower level of their Green Place residence, and Cayce said they initially thought something had fallen to the floor above them.

"We all looked at each other," Cayce said, adding that her daughter "was a little worried."

Cayce went upstairs to check it out. Nothing had fallen over, she said, but when she opened the door to look outside, she spotted a clear bottle alongside the concrete front porch.

At first, Cayce said, she thought someone had thrown the bottle into her front yard. But then she saws that "it was torn up like it had exploded," with what looked like clear soda around it, and traces of aluminum foil or tape scattered nearby.

"I looked down at it and I didn't want to touch it," she said. "It smelled chemical-like."

Longmont Police Officer Graham Wale reported that authorities found a thin strip of aluminum-type foil paper on the concrete porch of the Green Place residence and that there were wet patches on the northeast corner of the porch. A foam puddle spread from the clear plastic bottle and spray trailed up to six feet away from the bottle, he said.

The Longmont Fire Department, which also dispatched units to Green Place, identified the device as an acid bomb, Wale said.

Several of Cayce's Green Place neighbors told police they'd heard a bang but didn't see any vehicles or people in the street when they looked out their windows, Wale said. However, one person who gathered outside the Green Place residence after authorities arrived reported seeubg an older-style Ford Bronco in the area just before the explosion, he said.

A woman also told police she saw a white cloud in front of the door of the home where the bottle exploded, he said.

As for the incident on the 700 block of Elliott Street almost half an hour later, Longmont Police Officer Jessica Carbajal wrote in a report that a two-liter bottle with an acidic substance in it exploded beneath a vehicle parked next to a house.

A resident of Elliott Street said Sunday he though the explosion happened across the street from his home, but no one was there on Sunday afternoon.

Cayce said Sunday that her family has come up with a name for the suspects -- "the Dead-End Bombers" -- because her Green Place residence is in a cul-de-sac and the eastside incident happened near where East Longs Peak Avenue dead-ends in a "T" intersection with Elliot Street.

Anyone with information about either incident is asked to call Longmont police dispatch, at 651-8501, or Northern Colorado Crime Stoppers at 1-800-222-8477.

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